Just-in-Time (JIT)

used to refer a production system in which both the processing and movements of goods occur

just as they are needed, usually in small batches

JIT is a characteristic of lean production system, which operates with very little “fat”

Benefits

• Lower processing cost• Fewer defects• Greater flexibility

Just-in-Time (JIT)Objectives

• Eliminate disruption

• Make system flexible by reducing setup time and lead time

• Eliminate waste, especially excess inventory

Building Blocks

• Product design• Process design• Personnel/organizational elements• Manufacturing planning & control

Just-in-Time (JIT)

Product Design

• Standard Parts: workers have fewer parts to deal with, training time and costs are reduced

• Modular design: clusters of parts treated as a single unit

• Highly capable production system: poor quality can create major

disruption

Just-in-Time (JIT)Process Design

• Small lot size

• Setup time reduction

• Manufacturing cells

• Limited WIP

• Quality improvement

• Production flexibility

• Little inventory storage

Just-in-Time (JIT)

Personnel/Organizational Elements

• Workers as asset

• Cross-trained workers

• Continuous improvement

• Cost accounting

• Leadership

Manufacturing Planning & Control

• Level loading

• Pull system

• Visual system

• Close vendor relationship

• Reduced transaction process

Just-in-Time (JIT)

• Preventive maintenance

Just-in-Time (JIT)Kanban System